解方程每一步我都要哦!(1+30%)*90%X+(1+20%)*90%X(200-X)90%=200+27.7
解方程每一步我都要哦!(1+30%)*90%X+(1+20%)*90%X(200-X)90%=200+27.7
数学人气：983 ℃时间：2020-05-01 21:16:52
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(1+30%)*90%X+(1+20%)*90%X(200-X)90%=200+27.71.3×0.9x+1.2×0.9x（200-x）×0.9=227.71.17x+1.18x（180-0.9x）=227.71.17x+212.4x-0.9x=227.7212.67x=227.7x=21267/22770
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